Can These Coatings Be Applied to Fibreglass Roofs?

What makes Prolux suitable for fibreglass

Prolux PU coating is formulated as a two-component polyurethane coating and lists fibreglass among its intended surface types, alongside concrete, ceramic, plastic and properly prepared steel. For a roof, the useful properties are its resistance to UV light and weathering, which help maintain appearance and surface protection outdoors.

It is not a single-purpose roof paint, so you should still review the product details for your specific roof type. The same coating is available in gloss or satin, with a wide colour range.

How to prepare a fibreglass roof

Preparation is the main factor behind a successful bond. The roof should be clean, dry and free from dirt, grease, moss or previous loose coatings. If the gelcoat is very smooth or glossy, a light mechanical key can help the coating grip, but any sanding should be even and followed by removing dust.

• Wash the roof and allow it to dry thoroughly.
• Check for cracks, loose edges or water damage and repair them first.
• Mask surrounding trims and vents carefully.
• Mix the two Prolux components at the stated 2:1 ratio and follow the coverage guidance supplied with the product.

When this matters

This is especially relevant when a motorhome or caravan roof sits outside for long periods. Fibreglass can look sound but hold fine surface contamination that reduces adhesion. If the roof is occasionally walked on, the coating also needs to cope with foot traffic and movement. Prolux has high abrasion resistance, but a roof that flexes should be inspected before coating so that existing stress cracks are not simply covered over.